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It takes very little voltage and amperage to operate dash gauges. You cannot rely on "seems" when it comes to the battery. A good battery should have standing voltage of at least 12v and be able to "snap back" from a fifteen second 200 amp load. Under load, the voltage should not drop lower than 9.5 volts. Have the battery charged and load tested before going anywhere else with this. then make sure connections are clean and tight. After you get it started, if battery was good, check starter draw and charging system operation. If it does not start, check power flow from key through neutral safety switch and starter relay to starter.

P0505 means the whole Idle Control system, not only the IAM. Check all related sensors (i.e. crankshaft sensor). Check with a voltmeter direct at the connector of the IAM if you get any signal. Remove the IAM from the TB, connect him, let someone switch your ignition key to ON. The IAM need to drive in/out for a short time to find the right position. Hold the IAM near a hard part, that they cant drive out completely! If IAM works fine, check the fuel pressure, check and clean your TB ( if not done yet). If that doesn't work, come back again please

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I would check that the circulating water pump connected to the radiator is working properly. Why else is the temperature fluctuating? Get a computer read on that engine- a free diagnosis from the service department at the dealer should take about two minutes and tell you everything. Only the dealer can pull up the total diagnosis, because certain codes can only be recovered by the brand equipment. NOT Autozone

sounds like a ground problem. Or a short. I would get a helper and have them sit in truck and watch gauges and things and i would get under the hood and wiggle every wire i could untill i found the loose one.

when the transmission overheat light (this is for the fluid) comes on the transmission control module pulls the trans out of OD to try and cool it down, this is called failure mode strategy, it is built into the programming of the control module, the signal from the trans is most likely incorrect, but the module doesn't know that, replace the transmission fluid temperature sensor.